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 protected void Application_BeginRequest(Object sender, EventArgs e)
    {
        string oldUrl = HttpContext.Current.Request.RawUrl;

        string pattern = @”^(.+)News(/d+)/.html(/?.*)*$”;
        string replace = “$1NewsDetails.aspx?NID=$2”;
        if (Regex.IsMatch(oldUrl, pattern, RegexOptions.IgnoreCase | RegexOptions.Compiled))
        {
            string newUrl = Regex.Replace(oldUrl, pattern, replace, RegexOptions.Compiled | RegexOptions.IgnoreCase);
            this.Context.RewritePath(newUrl);
        }

}